我正在下载文件并获取它的本地方式,如下所示：
文件：///Users/administrator/Library/Developer/CoreSimulator/Devices/4CDF286B-543F-4137-B5E2-C312E19B992F/data/Containers/Data/Application/E5F13797-A6A8-48A1-B3C3-FBC3D7A03151/Documents/4d13e04980d3.mp3

现在我想用AVAudioPlayer播放这个文件,但我总是收到这个错误：

file:///
Error Domain=NSOSStatusErrorDomain Code=2003334207 "(null)"

比赛代码：

var alertSound = NSURL(fileURLWithPath: "file:///Users/administrator/Library/Developer/CoreSimulator/Devices/4CDF286B-543F-4137-B5E2-C312E19B992F/data/Containers/Data/Application/E5F13797-A6A8-48A1-B3C3-FBC3D7A03151/Documents/4d13e04980d3.mp3")
        print(alertSound)

        var error:NSError?
        do {
            try audioPlayer = AVAudioPlayer(contentsOfURL: alertSound)
            audioPlayer.prepareToPlay()
            audioPlayer.play()
        } catch {
            print(error)
        }

我该怎么玩呢？